#!/usr/bin/env python

# encoding: utf-8

#

# partially based on boost.py written by Gernot Vormayr

# written by Ruediger Sonderfeld <ruediger@c-plusplus.de>, 2008

# modified by Bjoern Michaelsen, 2008

# modified by Luca Fossati, 2008

# rewritten for waf 1.5.1, Thomas Nagy, 2008

# rewritten for waf 1.6.2, Sylvain Rouquette, 2011

'''

This is an extra tool, not bundled with the default waf binary.

To add the boost tool to the waf file:

$ ./waf-light --tools=compat15,boost

	or, if you have waf >= 1.6.2

$ ./waf update --files=boost

When using this tool, the wscript will look like:

	def options(opt):

		opt.load('compiler_cxx boost')

	def configure(conf):

		conf.load('compiler_cxx boost')

		conf.check_boost(lib='system filesystem')

	def build(bld):

		bld(source='main.cpp', target='app', use='BOOST')

Options are generated, in order to specify the location of boost includes/libraries.

The `check_boost` configuration function allows to specify the used boost libraries.

It can also provide default arguments to the --boost-static and --boost-mt command-line arguments.

Everything will be packaged together in a BOOST component that you can use.

When using MSVC, a lot of compilation flags need to match your BOOST build configuration:

 - you may have to add /EHsc to your CXXFLAGS or define boost::throw_exception if BOOST_NO_EXCEPTIONS is defined.

   Errors: C4530

 - boost libraries will try to be smart and use the (pretty but often not useful) auto-linking feature of MSVC

   So before calling `conf.check_boost` you might want to disabling by adding:

   	conf.env.DEFINES_BOOST += ['BOOST_ALL_NO_LIB']

   Errors: 

 - boost might also be compiled with /MT, which links the runtime statically.

   If you have problems with redefined symbols, 

		self.env['DEFINES_%s' % var] += ['BOOST_ALL_NO_LIB']

		self.env['CXXFLAGS_%s' % var] += ['/MD', '/EHsc']

Passing `--boost-linkage_autodetect` might help ensuring having a correct linkage in some basic cases.

'''

import sys

import re

from waflib import Utils, Logs, Errors

from waflib.Configure import conf

from waflib.Errors import WafError

BOOST_LIBS = ['/usr/lib', '/usr/local/lib', '/opt/local/lib', '/sw/lib', '/lib']

BOOST_INCLUDES = ['/usr/include', '/usr/local/include', '/opt/local/include', '/sw/include']

BOOST_VERSION_FILE = 'boost/version.hpp'

BOOST_VERSION_CODE = '''

#include <iostream>

#include <boost/version.hpp>

int main() { std::cout << BOOST_LIB_VERSION << std::endl; }

'''

# toolsets from {boost_dir}/tools/build/v2/tools/common.jam

PLATFORM = Utils.unversioned_sys_platform()

detect_intel = lambda env: (PLATFORM == 'win32') and 'iw' or 'il'

detect_clang = lambda env: (PLATFORM == 'darwin') and 'clang-darwin' or 'clang'

detect_mingw = lambda env: (re.search('MinGW', env.CXX[0])) and 'mgw' or 'gcc'

BOOST_TOOLSETS = {

	'borland':  'bcb',

	'clang':	detect_clang,

	'como':	 'como',

	'cw':	   'cw',

	'darwin':   'xgcc',

	'edg':	  'edg',

	'g++':	  detect_mingw,

	'gcc':	  detect_mingw,

	'icpc':	 detect_intel,

	'intel':	detect_intel,

	'kcc':	  'kcc',

	'kylix':	'bck',

	'mipspro':  'mp',

	'mingw':	'mgw',

	'msvc':	 'vc',

	'qcc':	  'qcc',

	'sun':	  'sw',

	'sunc++':   'sw',

	'tru64cxx': 'tru',

	'vacpp':	'xlc'

}

def options(opt):

	opt.add_option('--boost-includes', type='string',

				   default='', dest='boost_includes',

				   help='''path to the boost includes root (~boost root)

				   e.g. /path/to/boost_1_47_0''')

	opt.add_option('--boost-libs', type='string',

				   default='', dest='boost_libs',

				   help='''path to the directory where the boost libs are

				   e.g. /path/to/boost_1_47_0/stage/lib''')

	opt.add_option('--boost-static', action='store_true',

				   default=False, dest='boost_static',

				   help='link with static boost libraries (.lib/.a)')

	opt.add_option('--boost-mt', action='store_true',

				   default=False, dest='boost_mt',

				   help='select multi-threaded libraries')

	opt.add_option('--boost-abi', type='string', default='', dest='boost_abi',

				   help='''select libraries with tags (dgsyp, d for debug),

				   see doc Boost, Getting Started, chapter 6.1''')

	opt.add_option('--boost-linkage_autodetect', action="store_true", dest='boost_linkage_autodetect',

				   help="auto-detect boost linkage options (don't get used to it / might break other stuff)")

	opt.add_option('--boost-toolset', type='string',

				   default='', dest='boost_toolset',

				   help='force a toolset e.g. msvc, vc90, \

						gcc, mingw, mgw45 (default: auto)')

	py_version = '%d%d' % (sys.version_info[0], sys.version_info[1])

	opt.add_option('--boost-python', type='string',

				   default=py_version, dest='boost_python',

				   help='select the lib python with this version \

						(default: %s)' % py_version)

@conf

def __boost_get_version_file(self, dir):

	try:

		return self.root.find_dir(dir).find_node(BOOST_VERSION_FILE)

	except:

		return None

@conf

def boost_get_version(self, dir):

	"""silently retrieve the boost version number"""

	re_but = re.compile('^#define\\s+BOOST_LIB_VERSION\\s+"(.*)"$', re.M)

	try:

		val = re_but.search(self.__boost_get_version_file(dir).read()).group(1)

	except:

		val = self.check_cxx(fragment=BOOST_VERSION_CODE, includes=[dir], execute=False, define_ret=True)

	return val

@conf

def boost_get_includes(self, *k, **kw):

	includes = k and k[0] or kw.get('includes', None)

	if includes and self.__boost_get_version_file(includes):

		return includes

	for dir in BOOST_INCLUDES:

		if self.__boost_get_version_file(dir):

			return dir

	if kw.get('boost_mandatory', True):

		if includes:

			self.fatal('headers not found in %s' % includes)

		else:

			self.fatal('headers not found, please provide a --boost-includes argument (see help)')

@conf

def boost_get_toolset(self, cc):

	toolset = cc

	if not cc:

		build_platform = Utils.unversioned_sys_platform()

		if build_platform in BOOST_TOOLSETS:

			cc = build_platform

		else:

			cc = self.env.CXX_NAME

	if cc in BOOST_TOOLSETS:

		toolset = BOOST_TOOLSETS[cc]

	return isinstance(toolset, str) and toolset or toolset(self.env)

@conf

def __boost_get_libs_path(self, *k, **kw):

	''' return the lib path and all the files in it '''

	if 'files' in kw:

		return self.root.find_dir('.'), Utils.to_list(kw['files'])

	libs = k and k[0] or kw.get('libs', None)

	if libs:

		path = self.root.find_dir(libs)

		files = path.ant_glob('*boost_*')

	if not libs or not files:

		for dir in BOOST_LIBS:

			try:

				path = self.root.find_dir(dir)

				files = path.ant_glob('*boost_*')

				if files:

					break

				path = self.root.find_dir(dir + '64')

				files = path.ant_glob('*boost_*')

				if files:

					break

			except:

				path = None

	if not path:

		if libs:

			self.fatal('libs not found in %s' % libs)

		else:

			self.fatal('libs not found, please provide a --boost-libs argument (see help)')

	self.to_log('Found the boost path in %r with the libraries:' % path)

	for x in files:

		self.to_log('    %r' % x)

	return path, files

@conf

def boost_get_libs(self, *k, **kw):

	'''

	return the lib path and the required libs

	according to the parameters

	'''

	path, files = self.__boost_get_libs_path(**kw)

	t = []

	if kw.get('mt', False):

		t.append('mt')

	if kw.get('abi', None):

		t.append(kw['abi'])

	tags = t and '(-%s)+' % '-'.join(t) or ''

	toolset = self.boost_get_toolset(kw.get('toolset', ''))

	toolset_pat = '(-%s[0-9]{0,3})+' % toolset

	version = '(-%s)+' % self.env.BOOST_VERSION

	def find_lib(re_lib, files):

		for file in files:

			if re_lib.search(file.name):

				self.to_log('Found boost lib %s' % file)

				return file

		return None

	def format_lib_name(name):

		if name.startswith('lib') and self.env.CC_NAME != 'msvc':

			name = name[3:]

		return name[:name.rfind('.')]

	libs = []

	for lib in Utils.to_list(k and k[0] or kw.get('lib', None)):

		py = (lib == 'python') and '(-py%s)+' % kw['python'] or ''

		# Trying libraries, from most strict match to least one

		for pattern in ['boost_%s%s%s%s%s' % (lib, toolset_pat, tags, py, version),

						'boost_%s%s%s%s' % (lib, tags, py, version),

						'boost_%s%s%s' % (lib, tags, version),

						# Give up trying to find the right version

						'boost_%s%s%s%s' % (lib, toolset_pat, tags, py),

						'boost_%s%s%s' % (lib, tags, py),

						'boost_%s%s' % (lib, tags)]:

			self.to_log('Trying pattern %s' % pattern)

			file = find_lib(re.compile(pattern), files)

			if file:

				libs.append(format_lib_name(file.name))

				break

		else:

			self.fatal('lib %s not found in %s' % (lib, path.abspath()))

	return path.abspath(), libs

@conf

def check_boost(self, *k, **kw):

	"""

	Initialize boost libraries to be used.

	Keywords: you can pass the same parameters as with the command line (without "--boost-").

	Note that the command line has the priority, and should preferably be used.

	"""

	if not self.env['CXX']:

		self.fatal('load a c++ compiler first, conf.load("compiler_cxx")')

	params = {'lib': k and k[0] or kw.get('lib', None)}

	for key, value in self.options.__dict__.items():

		if not key.startswith('boost_'):

			continue

		key = key[len('boost_'):]

		params[key] = value and value or kw.get(key, '')

	var = kw.get('uselib_store', 'BOOST')

	self.start_msg('Checking boost includes')

	try:

		self.env['INCLUDES_%s' % var] = self.boost_get_includes(**params)

		self.env.BOOST_VERSION = self.boost_get_version(self.env['INCLUDES_%s' % var])

	except WafError:

		self.end_msg("not found", 'YELLOW')

		raise

	#self.env['INCLUDES_%s' % var] = inc = self.boost_get_includes(**params)

	#self.env.BOOST_VERSION = self.boost_get_version(inc)

	self.end_msg(self.env.BOOST_VERSION)

	if Logs.verbose:

		Logs.pprint('CYAN', '	path : %s' % self.env['INCLUDES_%s' % var])

	if not params['lib']:

		return

	self.start_msg('Checking boost libs')

	try:

		suffix = params.get('static', 'ST') or ''

		path, libs = self.boost_get_libs(**params)

	except WafError:

		self.end_msg("not found", 'YELLOW')

		raise

	#suffix = params.get('static', None) and 'ST' or ''

	#path, libs = self.boost_get_libs(**params)

	self.env['%sLIBPATH_%s' % (suffix, var)] = [path]

	self.env['%sLIB_%s' % (suffix, var)] = libs

	self.end_msg('ok')

	if Logs.verbose:

		Logs.pprint('CYAN', '	path : %s' % path)

		Logs.pprint('CYAN', '	libs : %s' % libs)

	def try_link():

		if 'system' in params['lib']:

			self.check_cxx(

			 fragment="\n".join([

			  '#include <boost/system/error_code.hpp>',

			  'int main() { boost::system::error_code c; }',

			 ]),

			 use=var,

			 execute=False,

			)

		if 'thread' in params['lib']:

			self.check_cxx(

			 fragment="\n".join([

			  '#include <boost/thread.hpp>',

			  'int main() { boost::thread t; }',

			 ]),

			 use=var,

			 execute=False,

			)

	if params.get('linkage_autodetect', False):

		self.start_msg("Attempting to detect boost linkage flags")

		toolset = self.boost_get_toolset(kw.get('toolset', ''))

		if toolset in ['vc']:

			# disable auto-linking feature, causing error LNK1181

			# because the code wants to be linked against

			self.env['DEFINES_%s' % var] += ['BOOST_ALL_NO_LIB']

			# if no dlls are present, we guess the .lib files are not stubs

			has_dlls = False

			for x in Utils.listdir(path):

				if x.endswith(self.env.cxxshlib_PATTERN % ''):

					has_dlls = True

					break

			if not has_dlls:

				self.env['STLIBPATH_%s' % var] = [path]

				self.env['STLIB_%s' % var] = libs

				del self.env['LIB_%s' % var]

				del self.env['LIBPATH_%s' % var]

			# we attempt to play with some known-to-work CXXFLAGS combinations

			for cxxflags in (['/MD', '/EHsc'], []):

				self.env.stash()

				self.env["CXXFLAGS_%s" % var] += cxxflags

				try:

					try_link()

					self.end_msg("ok: winning cxxflags combination: %s" % (self.env["CXXFLAGS_%s" % var]))

					e = None

					break

				except Errors.ConfigurationError as exc:

					self.env.revert()

					e = exc

			if e is not None:

				self.fatal("Could not auto-detect boost linking flags combination, you may report it to boost.py author", ex=e)

		else:

			self.fatal("Boost linkage flags auto-detection not implemented (needed ?) for this toolchain")

	else:

		self.start_msg('Checking for boost linkage')

		try:

			try_link()

		except Errors.ConfigurationError as e:

			self.fatal("Could not link against boost libraries using supplied options")

		self.end_msg('ok')